check for Unicode being used under Win9x much earlier on startup as otherwise the app crashes before getting to this check

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@34544 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/main.cpp

@@ -262,6 +262,28 @@ WXDLLEXPORT int wxEntry(HINSTANCE hInstance,
                         wxCmdLineArgType WXUNUSED(pCmdLine),
                         int nCmdShow)
 {
+    // the first thing to do is to check if we're trying to run an Unicode
+    // program under Win9x w/o MSLU emulation layer - if so, abort right now
+    // as it has no chance to work and has all chances to crash
+#if wxUSE_UNICODE && !wxUSE_UNICODE_MSLU && !defined(__WXWINCE__)
+    if ( wxGetOsVersion() != wxWINDOWS_NT )
+    {
+        // note that we can use MessageBoxW() as it's implemented even under
+        // Win9x - OTOH, we can't use wxGetTranslation() because the file APIs
+        // used by wxLocale are not
+        ::MessageBox
+        (
+         NULL,
+         _T("This program uses Unicode and requires Windows NT/2000/XP.\nProgram aborted."),
+         _T("wxWidgets Fatal Error"),
+         MB_ICONERROR | MB_OK
+        );
+
+        return -1;
+    }
+#endif // wxUSE_UNICODE && !wxUSE_UNICODE_MSLU
+
+
     // remember the parameters Windows gave us
     wxSetInstance(hInstance);
     wxApp::m_nCmdShow = nCmdShow;